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SUMMARY:Young@INFN 2025: 5th event - X17
DTSTART:20250612T143000Z
DTEND:20250612T163000Z
DTSTAMP:20260710T200900Z
UID:indico-event-46567@agenda.infn.it
DESCRIPTION:Speakers: Stefano Scacco (Istituto Nazionale di Fisica Nuclear
 e)\n\nSpeaker: Stefano Scacco\nTitle: On the Atomki nuclear anomaly after 
 the MEG-II result\nAbstract: Recent experimental results from the Atomki c
 ollaboration have reported the observation of anomalous effects in Berylli
 um\, Helium and Carbon nuclear transitions that could hint at physics beyo
 nd the Standard Model. However\, the MEG-II experiment has recently found 
 no significant anomalous signal in the Beryllium transition Be* → Be e+
 e-. In view of this result\, we critically re-examine the possible theoret
 ical interpretations of the anomalies observed by the Atomki experiment in
  terms of a new boson X with mass around 17 MeV. The present work aims to 
 study the phenomenology of a spin-2 state and revisit the possibility of a
  pure CP-even scalar\, which was initially dismissed due to its inability 
 to explain the Beryllium anomalous signal. Our analysis shows that a spin-
 2 state is highly disfavoured by the SINDRUM constraint while a scalar bos
 on could explain the Helium and Carbon anomalies while being compatible wi
 th other experimental constraints.\n\nhttps://agenda.infn.it/event/46567/
LOCATION:Aula Rasetti (Dipartimento di Fisica - Edi. Marconi)
URL:https://agenda.infn.it/event/46567/
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